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ludwig457
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Find the area of an equilateral triangle with side of length 18. (Round your answer to one decimal place.)
 2 years ago
 2 years ago
ludwig457 Group Title
Find the area of an equilateral triangle with side of length 18. (Round your answer to one decimal place.)
 2 years ago
 2 years ago

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ludwig457 Group TitleBest ResponseYou've already chosen the best response.1
Area= 1/2 base x height tan(60)=h/18 h=18tan(60) right?
 2 years ago

ludwig457 Group TitleBest ResponseYou've already chosen the best response.1
should i be using law of sines
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
why use law of sines?
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
wait...by law of sines do you mean \[\frac{a}{\sin A} = \frac b{\sin B} = \frac c{\sin C}\]
 2 years ago

ludwig457 Group TitleBest ResponseYou've already chosen the best response.1
yes, i have three angles (60) and three sides) so the how would i then find the height
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
use pythagorean theorem...you have equilateral triangle dw:1352707222314:dw
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
so the height would cut your triangle into two equal parts..dw:1352707262694:dw can you see how to get the height now?
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
now use your 1/2 bh
 2 years ago

ludwig457 Group TitleBest ResponseYou've already chosen the best response.1
A=(1/2)(18)15.6)
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
by the way.. you can also use your solution a while ago... 18tan (60) you don't need law of sines...just use a calculator for that
 2 years ago

ludwig457 Group TitleBest ResponseYou've already chosen the best response.1
140.4units squared
 2 years ago

ludwig457 Group TitleBest ResponseYou've already chosen the best response.1
and that solution from earlier would then give me the height?
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
hmm wait...something's wrong with it...let me find it first
 2 years ago

ludwig457 Group TitleBest ResponseYou've already chosen the best response.1
should it be 9 instead of 18
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.1
yes it should be 9
 2 years ago
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